Gas-scrubing apparatus.



No; 890,450. PATENTED JUNE 9, 1908. P. PLANTINGA.

GAS SORUBBING APPARATUS.

APPLICATION nun) MAY 31, 1904.

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PATENTED JUNE 9, 1908. P. PLANTINGA.

GAS SGRUBBING APPARATUS.

APPLICATION FILED an 31, 1904.

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PIERRE PLANTINGA, OF CLEVELAND, OHIO.

GAS-SCRUIBBING APPARATUS.

Application filed May 31, 1904. Serial N 0. 210,400

I Specification of Letters Patent.

Patented June 9, 1908.

is a'sp'eoification, the principle onbein herein explained and mode WhicI have contemplated ap principle so as to distinguish it rom ot erinventions.

My invention relates to devices for removing impurities, andparticularly for removing ammonia,..from illuminating gas, that classof. such devices being technically known as The object of the inventionis to; provide means for. effecting the scrubbing operation whichjwillbeeconomical in construction and efficient in its operation.

Said inventionconsists of means hereinafter fully described andparticularly set forth in the claims v y The annexed drawings andthefollowing description set forth in detailcertain mecha anismembodying ,the invention, such disclosed meansfconstituting b'uti one'ofvarious mechanical-forms in Wlllch the; principle of the inventionrmaybe used.

In said annexed drawingsz-f Figure 1 represents an elevational viewofan. apparatus partly in section :embodyi'ng my invention. Fig. 2represents a similar view of a modified form of ap aratus. J

The sauf apparatus consists of two main elements, namely a primarywashing device or washer A, and a secondary washing device or scrubberB. The said washer A may be of any desired construction such as i isused to efiect a removalof ammonia, which may be designated as rimaryinsofar as relates to the process eff inafter described improved aparatus. The said washer need not hence e described in detail furtherthan to state that it consists of a reservoir for water, through whichthe gas passes from an inlet pipe-a, such gaspassing out throughan'outlet or discharge ipe a connected, as will be further'describedwith the scrubber B.

Under ordinary conditions from 40 to 45 ercent. of the ammonia containedin the gas is removed before the latter enters the washer oftheremainder about 40 percent. will be removed by the washer, and; aboutremoved by the scrubberi The. removal '1) with which ected by my hereofthe latter amount of ammonia is, as

will be further described, accomplished in two steps, about 45percent.,being removed mone step and the remaining 15 percent. in theother.

I The said scrubber, in the form illustrated in Fig. 1, consists mainlyof a tower which is divided into an upper compartmentB and a lowercompartment B, each com artment being provided with means for fine ydividmg or comminuting liquid which may be caused to flow Y down throughit. Such means I have shown to consist of a series of horizontal woodentrays b I) each composed of checker-work, but they may consist of layersof coke, excelsior or similar material. The bottom of compartment Bforms an inclosed reservoir 1) into the u per part of which the gasdischarge pipe a, o the washer leads, and which is also connected withthe reservoir of said washer by means of an overflow pipe 6 through themedium of which liquor in reservoir b may fiow into the reservoir ofwasher A, as will be readily understood. A disment B and conducts thegas after having passed throu h the tower,'to the purifiers.

At the top 0 compartment'B, is a sprayin'g spider I; made of perforatedpi e, which is connected with. a pum draws its sup ly of liquor rom thereservoir it is roperly connected, as shown, by means 0? a pipe b Bysuch means the liquor from'reservoir b" is pumped up to the top ofcompartment B, sprayed.

and flows back into the said reservoir, it being, however, subjected tothe comminuting operation in transit.

Above compartment 13 is a flushing tank D which is fed from afresh-water supply ipe D, by means of which a supply of fiesh water isperiodically fed to a spider b which sprays sameinto the top ofcompartment 13*. Such fresh water asses downwardly through compartments2 and B and finally reaches reservoir 1), being also subjeoted to thecomrninuting operation during such transit.

The form of apparatus illustrated in Fig. difiers from that shown inFig. 1, only in the relative disposition of the two compartments B B.,These, instead. of being superimposed, are laced side by side,.and thereservoir b is ivided into .two. arts freely connected, however, by apipe intermediate gas-duct b is furtherreq'uired to con- C. T e lattersecond compartment.

the same,

duct the ggas from the top of the first comartment to the bottom of thesecond B he periodic flushin device D is disposed above compartment %3as in the other construction, and pump C is connected to raise theliquor from the portion of reservoir 1) situated beneath compartment Band discharge it through spraying spider?) in the to of compartment B.

11 use the operation of either form of scrubber is essentially the same.The course of the as is into washer A by way of inlet a, throug saidwasher, thence by way of duct a to the first compartment B and upwardlythrough the same, and finally u wardly through second compartmentpassing first through intermedlate duct b in case the two compartmentsare situated side by side, instead of one above the other. Having beenthus assed through the scrubber the' gas is conducted away throughdischarge duct 11 leadingfrom the top of the The course of flow of theabsorbing liquor is, at all places where it comes in contact with thegas, opposite'in direction to the fiow of such gas. Thus fresh water isadmitted through s ray 1) into the top of compartment B an percolatesdownwardly through the scrubber filling in and is brought into intimatecontact with the stream of gas which is flowing uipwardly therethrough.Since the amount 0 fresh water here introduced is relatively small, itis very apt, when spra ed in with a constant and necessarily sma stream,to flow down through regular channels, and wet but a small art of thescrubber filling, with a relative ecrease in efficiency. It is toovercome this difiiculty of the water forming rat holes, that I use theflushing device D in connection with the second compartment,

which flushes the fillingmaterial at regular intervals. Thus, forinstance, instead of admitting, say, of a allon every second, theflushin ap aratus a mits three (3) gallons at interva s o one-halfminutes; this comparativel large amount of water is readily eve ydistributed.

The liquor, upon passing through compartment B continues its course downthrough compartment B in the first form of construction; in the secondform it collects in the chamber 6 in the bottom of such compartment,only, however, to be pum ed to the top of the first compartment throughwhich it flows as in the first case. After passing through this firstcompartment, the iquor collects in chamber b of such compartment, fromwhich it escapes by drain 6 u on reaching the level of the inneropening, of the drain. The two chambers b, as has been stated, arefreely connected, and the level of the liquid is accordingly the same inboth. The pump s rays more of the liquor into compartment 1% than thereis fresh water sprayed into compartment B and the bottom chamber b ofcompartment 13 in the second form would be pumped dry were not thebottom chamber of the two scrubbers connected as has been described.Enough liquor will therefore flow fromthe bottom of compartment B tothat of compartment B to make up for the difference between the amountof li uor pumped and fresh water admitted, and an amount willre ularlyflow away through drain pipe I) equa to that of such fresh wateradmitted. In the first form of construction one bottom chamber only isemployed.

The apparatus described, it is accordingly seen, provides for thegradual and successive removal of ammonia, the gas most heavily chargedtherewith meetin the strongest liquor first; as such gas a vancesTitwill be purer and is scrubbed with weaker liquor, which of course hasgreater absorptive power, until at the top of the last com artment itreceives its last scrubbing with resh water. The liquoris, furthermore,not exposed'to 'the atmosphere during its progress through the scrub erand evaporation and consequent waste is thus avo1ded.

Other modes of a plying the rinciple of my invention may he em loyedinstead of the one explained, change bein made as regards the mechanismherein disclosed provided the means stated by any one of the followingclaims or the equivalent of such stated means. be employed.

I therefore particularly point out and distinctly claim asmyinvent1on 1. A gas-purifying apparatus, comprising a primary washer,and a secondary washer consisting of two compartments, the top of thefirst of said compartments being connected with the bottom of the secondso as to permit the flow of as therethrough in series, means foreriodlcally su plying fresh purifying liquid to the top 0 said secondcompartment, a pump for supplying such liquid,

after it has passed through such second compartment, to the first, andan overflow ipe connecting said primary washer to said astnamedcompartment of the secondary washer. 2. A gas-purifying apparatus,comprising a primary washer, a secondary washer consisting of twocompartments, a gas duct connecting the top of one of said compartmentswith the bottom of the other, means for periodically supplying freshpurifyin liquid to one of said com artments, a pump or supplyingsuchliqui such'one compartment, to the other, and an overflow pipeconnecting said primary washerto said last-named compartment of thesecondary washer.

3. A gas-purifying arparatus, comprising a primary washer, provl ed witha liquid reservoir, a secondary Washer consisting of two compartments, agas conduitconnecting said.

, after it has passed through Y primary Washer with one of thecompartments of the secondary washer, a gas duct connectin the top ofone of said compartments with the bottom of the other com artment, meansfor periodically supplying resh purifying liquidto one of saidcompartments, and a pump for supplying such liquid, after it has passedthrough such one compartment, to thepther. Ifi 4. asur' in a aratus, comrisin a primar y washes: pi oviiied with a liqliid res ervoir, asecondary Washer consisting-0f two compartments, a gas conduitconnecting said primary washer with one of the compartments of thesecondary Washer, a gas duct connecting the top of oneof said' compartment, means for periodically supplying resh purifying'liquid to one ofsaid compartments,

such means consisting of a spray at the upper end of said com artmentcommunicating with a flushing tan and means for supplying such liquid,after it has passed through such one compartment, to the other, suchmeans consistin of a pump and a spray at the upper end 0 such othercompartment.

Signed by me, this 28 day of May, 1904.

PIERRE PLANTINGA.

Attested by:

G. W. SAYWELL, A. E. MnRKEL.

